/Engine/Source/Runtime/Net/Core/Public/Net/Core/Misc/PacketAudit.h
On the receive side, checks to see that a named stage was marked for auditing on the send side, and audits the packet data.
static void CheckStage ( [FString](API\Runtime\Core\Containers\FString) StageName, [FBitReader](API\Runtime\Core\Serialization\FBitReader) & InPacket, bool bByteAligned )